/*
 * json.js 2012-10-08
 * 
 * Public Domain
 * 
 * No warranty expressed or implied. Use at your own risk.
 * 
 * This file has been superceded by http://www.JSON.org/json2.js
 * 
 * See http://www.JSON.org/js.html
 * 
 * This code should be minified before deployment. See
 * http://javascript.crockford.com/jsmin.html
 * 
 * USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
 * NOT CONTROL.
 * 
 * This file adds these methods to JavaScript:
 * 
 * object.toJSONString(whitelist) This method produce a JSON text from a
 * JavaScript value. It must not contain any cyclical references. Illegal values
 * will be excluded.
 * 
 * The default conversion for dates is to an ISO string. You can add a
 * toJSONString method to any date object to get a different representation.
 * 
 * The object and array methods can take an optional whitelist argument. A
 * whitelist is an array of strings. If it is provided, keys in objects not
 * found in the whitelist are excluded.
 * 
 * string.parseJSON(filter) This method parses a JSON text to produce an object
 * or array. It can throw a SyntaxError exception.
 * 
 * The optional filter parameter is a function which can filter and transform
 * the results. It receives each of the keys and values, and its return value is
 * used instead of the original value. If it returns what it received, then
 * structure is not modified. If it returns undefined then the member is
 * deleted.
 * 
 * Example:
 *  // Parse the text. If a key contains the string 'date' then // convert the
 * value to a date.
 * 
 * myData = text.parseJSON(function (key, value) { return key.indexOf('date') >=
 * 0 ? new Date(value) : value; });
 * 
 * This file will break programs with improper for..in loops. See
 * http://yuiblog.com/blog/2006/09/26/for-in-intrigue/
 * 
 * This file creates a global JSON object containing two methods: stringify and
 * parse.
 * 
 * JSON.stringify(value, replacer, space) value any JavaScript value, usually an
 * object or array.
 * 
 * replacer an optional parameter that determines how object values are
 * stringified for objects. It can be a function or an array of strings.
 * 
 * space an optional parameter that specifies the indentation of nested
 * structures. If it is omitted, the text will be packed without extra
 * whitespace. If it is a number, it will specify the number of spaces to indent
 * at each level. If it is a string (such as '\t' or '&nbsp;'), it contains the
 * characters used to indent at each level.
 * 
 * This method produces a JSON text from a JavaScript value.
 * 
 * When an object value is found, if the object contains a toJSON method, its
 * toJSON method will be called and the result will be stringified. A toJSON
 * method does not serialize: it returns the value represented by the name/value
 * pair that should be serialized, or undefined if nothing should be serialized.
 * The toJSON method will be passed the key associated with the value, and this
 * will be bound to the object holding the key.
 * 
 * For example, this would serialize Dates as ISO strings.
 * 
 * Date.prototype.toJSON = function (key) { function f(n) { // Format integers
 * to have at least two digits. return n < 10 ? '0' + n : n; }
 * 
 * return this.getUTCFullYear() + '-' + f(this.getUTCMonth() + 1) + '-' +
 * f(this.getUTCDate()) + 'T' + f(this.getUTCHours()) + ':' +
 * f(this.getUTCMinutes()) + ':' + f(this.getUTCSeconds()) + 'Z'; };
 * 
 * You can provide an optional replacer method. It will be passed the key and
 * value of each member, with this bound to the containing object. The value
 * that is returned from your method will be serialized. If your method returns
 * undefined, then the member will be excluded from the serialization.
 * 
 * If the replacer parameter is an array of strings, then it will be used to
 * select the members to be serialized. It filters the results such that only
 * members with keys listed in the replacer array are stringified.
 * 
 * Values that do not have JSON representations, such as undefined or functions,
 * will not be serialized. Such values in objects will be dropped; in arrays
 * they will be replaced with null. You can use a replacer function to replace
 * those with JSON values. JSON.stringify(undefined) returns undefined.
 * 
 * The optional space parameter produces a stringification of the value that is
 * filled with line breaks and indentation to make it easier to read.
 * 
 * If the space parameter is a non-empty string, then that string will be used
 * for indentation. If the space parameter is a number, then the indentation
 * will be that many spaces.
 * 
 * Example:
 * 
 * text = JSON.stringify(['e', {pluribus: 'unum'}]); // text is
 * '["e",{"pluribus":"unum"}]'
 * 
 * 
 * text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t'); // text is
 * '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
 * 
 * text = JSON.stringify([new Date()], function (key, value) { return this[key]
 * instanceof Date ? 'Date(' + this[key] + ')' : value; }); // text is
 * '["Date(---current time---)"]'
 * 
 * 
 * JSON.parse(text, reviver) This method parses a JSON text to produce an object
 * or array. It can throw a SyntaxError exception.
 * 
 * The optional reviver parameter is a function that can filter and transform
 * the results. It receives each of the keys and values, and its return value is
 * used instead of the original value. If it returns what it received, then the
 * structure is not modified. If it returns undefined then the member is
 * deleted.
 * 
 * Example:
 *  // Parse the text. Values that look like ISO date strings will // be
 * converted to Date objects.
 * 
 * myData = JSON.parse(text, function (key, value) { var a; if (typeof value ===
 * 'string') { a =
 * /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
 * if (a) { return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], +a[5],
 * +a[6])); } } return value; });
 * 
 * myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) { var d; if
 * (typeof value === 'string' && value.slice(0, 5) === 'Date(' &&
 * value.slice(-1) === ')') { d = new Date(value.slice(5, -1)); if (d) { return
 * d; } } return value; });
 * 
 * 
 * This is a reference implementation. You are free to copy, modify, or
 * redistribute.
 */

/* jslint evil: true, regexp: true, unparam: true */

/*
 * members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply, call,
 * charCodeAt, getUTCDate, getUTCFullYear, getUTCHours, getUTCMinutes,
 * getUTCMonth, getUTCSeconds, hasOwnProperty, join, lastIndex, length, parse,
 * parseJSON, prototype, push, replace, slice, stringify, test, toJSON,
 * toJSONString, toString, valueOf
 */

// Create a JSON object only if one does not already exist. We create the
// methods in a closure to avoid creating global variables.
if (typeof JSON !== 'object') {
	JSON = {};
}

(function() {
	'use strict';

	function f(n) {
		// Format integers to have at least two digits.
		return n < 10 ? '0' + n : n;
	}

	if (typeof Date.prototype.toJSON !== 'function') {

		Date.prototype.toJSON = function(key) {

			return isFinite(this.valueOf()) ? this.getUTCFullYear() + '-'
					+ f(this.getUTCMonth() + 1) + '-' + f(this.getUTCDate())
					+ 'T' + f(this.getUTCHours()) + ':'
					+ f(this.getUTCMinutes()) + ':' + f(this.getUTCSeconds())
					+ 'Z' : null;
		};

		String.prototype.toJSON = Number.prototype.toJSON = Boolean.prototype.toJSON = function(
				key) {
			return this.valueOf();
		};
	}

	var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, gap, indent, meta = { // table
																																																																						// of
																																																																						// character
																																																																						// substitutions
		'\b' : '\\b',
		'\t' : '\\t',
		'\n' : '\\n',
		'\f' : '\\f',
		'\r' : '\\r',
		'"' : '\\"',
		'\\' : '\\\\'
	}, rep;

	function quote(string) {

		// If the string contains no control characters, no quote characters,
		// and no
		// backslash characters, then we can safely slap some quotes around it.
		// Otherwise we must also replace the offending characters with safe
		// escape
		// sequences.

		escapable.lastIndex = 0;
		return escapable.test(string) ? '"'
				+ string.replace(escapable, function(a) {
					var c = meta[a];
					return typeof c === 'string' ? c : '\\u'
							+ ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
				}) + '"'
				: '"' + string + '"';
	}

	function str(key, holder) {

		// Produce a string from holder[key].

		var i, // The loop counter.
		k, // The member key.
		v, // The member value.
		length, mind = gap, partial, value = holder[key];

		// If the value has a toJSON method, call it to obtain a replacement
		// value.

		if (value && typeof value === 'object'
				&& typeof value.toJSON === 'function') {
			value = value.toJSON(key);
		}

		// If we were called with a replacer function, then call the replacer to
		// obtain a replacement value.

		if (typeof rep === 'function') {
			value = rep.call(holder, key, value);
		}

		// What happens next depends on the value's type.

		switch (typeof value) {
			case 'string' :
				return quote(value);

			case 'number' :

				// JSON numbers must be finite. Encode non-finite numbers as
				// null.

				return isFinite(value) ? String(value) : 'null';

			case 'boolean' :
			case 'null' :

				// If the value is a boolean or null, convert it to a string.
				// Note:
				// typeof null does not produce 'null'. The case is included
				// here in
				// the remote chance that this gets fixed someday.

				return String(value);

				// If the type is 'object', we might be dealing with an object
				// or an array or
				// null.

			case 'object' :

				// Due to a specification blunder in ECMAScript, typeof null is
				// 'object',
				// so watch out for that case.

				if (!value) {
					return 'null';
				}

				// Make an array to hold the partial results of stringifying
				// this object value.

				gap += indent;
				partial = [];

				// Is the value an array?

				if (Object.prototype.toString.apply(value) === '[object Array]') {

					// The value is an array. Stringify every element. Use null
					// as a placeholder
					// for non-JSON values.

					length = value.length;
					for (i = 0; i < length; i += 1) {
						partial[i] = str(i, value) || 'null';
					}

					// Join all of the elements together, separated with commas,
					// and wrap them in
					// brackets.

					v = partial.length === 0 ? '[]' : gap
							? '[\n' + gap + partial.join(',\n' + gap) + '\n'
									+ mind + ']'
							: '[' + partial.join(',') + ']';
					gap = mind;
					return v;
				}

				// If the replacer is an array, use it to select the members to
				// be stringified.

				if (rep && typeof rep === 'object') {
					length = rep.length;
					for (i = 0; i < length; i += 1) {
						k = rep[i];
						if (typeof k === 'string') {
							v = str(k, value);
							if (v) {
								partial.push(quote(k) + (gap ? ': ' : ':') + v);
							}
						}
					}
				} else {

					// Otherwise, iterate through all of the keys in the object.

					for (k in value) {
						if (Object.prototype.hasOwnProperty.call(value, k)) {
							v = str(k, value);
							if (v) {
								partial.push(quote(k) + (gap ? ': ' : ':') + v);
							}
						}
					}
				}

				// Join all of the member texts together, separated with commas,
				// and wrap them in braces.

				v = partial.length === 0 ? '{}' : gap ? '{\n' + gap
						+ partial.join(',\n' + gap) + '\n' + mind + '}' : '{'
						+ partial.join(',') + '}';
				gap = mind;
				return v;
		}
	}

	// If the JSON object does not yet have a stringify method, give it one.

	if (typeof JSON.stringify !== 'function') {
		JSON.stringify = function(value, replacer, space) {

			// The stringify method takes a value and an optional replacer, and
			// an optional
			// space parameter, and returns a JSON text. The replacer can be a
			// function
			// that can replace values, or an array of strings that will select
			// the keys.
			// A default replacer method can be provided. Use of the space
			// parameter can
			// produce text that is more easily readable.

			var i;
			gap = '';
			indent = '';

			// If the space parameter is a number, make an indent string
			// containing that
			// many spaces.

			if (typeof space === 'number') {
				for (i = 0; i < space; i += 1) {
					indent += ' ';
				}

				// If the space parameter is a string, it will be used as the
				// indent string.

			} else if (typeof space === 'string') {
				indent = space;
			}

			// If there is a replacer, it must be a function or an array.
			// Otherwise, throw an error.

			rep = replacer;
			if (replacer
					&& typeof replacer !== 'function'
					&& (typeof replacer !== 'object' || typeof replacer.length !== 'number')) {
				throw new Error('JSON.stringify');
			}

			// Make a fake root object containing our value under the key of ''.
			// Return the result of stringifying the value.

			return str('', {
						'' : value
					});
		};
	}

	// If the JSON object does not yet have a parse method, give it one.

	if (typeof JSON.parse !== 'function') {
		JSON.parse = function(text, reviver) {

			// The parse method takes a text and an optional reviver function,
			// and returns
			// a JavaScript value if the text is a valid JSON text.

			var j;

			function walk(holder, key) {

				// The walk method is used to recursively walk the resulting
				// structure so
				// that modifications can be made.

				var k, v, value = holder[key];
				if (value && typeof value === 'object') {
					for (k in value) {
						if (Object.prototype.hasOwnProperty.call(value, k)) {
							v = walk(value, k);
							if (v !== undefined) {
								value[k] = v;
							} else {
								delete value[k];
							}
						}
					}
				}
				return reviver.call(holder, key, value);
			}

			// Parsing happens in four stages. In the first stage, we replace
			// certain
			// Unicode characters with escape sequences. JavaScript handles many
			// characters
			// incorrectly, either silently deleting them, or treating them as
			// line endings.

			text = String(text);
			cx.lastIndex = 0;
			if (cx.test(text)) {
				text = text.replace(cx, function(a) {
					return '\\u'
							+ ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
				});
			}

			// In the second stage, we run the text against regular expressions
			// that look
			// for non-JSON patterns. We are especially concerned with '()' and
			// 'new'
			// because they can cause invocation, and '=' because it can cause
			// mutation.
			// But just to be safe, we want to reject all unexpected forms.

			// We split the second stage into 4 regexp operations in order to
			// work around
			// crippling inefficiencies in IE's and Safari's regexp engines.
			// First we
			// replace the JSON backslash pairs with '@' (a non-JSON character).
			// Second, we
			// replace all simple value tokens with ']' characters. Third, we
			// delete all
			// open brackets that follow a colon or comma or that begin the
			// text. Finally,
			// we look to see that the remaining characters are only whitespace
			// or ']' or
			// ',' or ':' or '{' or '}'. If that is so, then the text is safe
			// for eval.

			if (/^[\],:{}\s]*$/
					.test(text
							.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
							.replace(
									/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,
									']').replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {

				// In the third stage we use the eval function to compile the
				// text into a
				// JavaScript structure. The '{' operator is subject to a
				// syntactic ambiguity
				// in JavaScript: it can begin a block or an object literal. We
				// wrap the text
				// in parens to eliminate the ambiguity.

				j = eval('(' + text + ')');

				// In the optional fourth stage, we recursively walk the new
				// structure, passing
				// each name/value pair to a reviver function for possible
				// transformation.

				return typeof reviver === 'function' ? walk({
							'' : j
						}, '') : j;
			}

			// If the text is not JSON parseable, then a SyntaxError is thrown.

			throw new SyntaxError('JSON.parse');
		};
	}

	// Augment the basic prototypes if they have not already been augmented.
	// These forms are obsolete. It is recommended that JSON.stringify and
	// JSON.parse be used instead.

	if (!Object.prototype.toJSONString) {
		Object.prototype.toJSONString = function(filter) {
			return JSON.stringify(this, filter);
		};
		Object.prototype.parseJSON = function(filter) {
			return JSON.parse(this, filter);
		};
	}
}());
